How many kilograms are in 1 stone?

One stone equals exactly 6.35029318 kilograms. For quick mental math, multiply stone by 6.35 or remember that 1 stone is roughly 6 kg and a third.

How do I convert stone to kilograms?

Multiply the number of stone by 6.35029. If the weight includes pounds, first convert the total to stone (divide remaining pounds by 14), then multiply by 6.35. For example, 11 stone 7 lbs = 11.5 stone × 6.35 = 73.03 kg.

Why does the UK use stone for body weight?

The stone has been used in the British Isles since medieval times. Although the UK adopted the metric system for trade in 1985, stone remained the cultural standard for personal weight because it was deeply embedded in everyday conversation and bathroom scales.

Stones to Kilograms (st to kg) Converter

1 st = 6.3503 kg

1 Stone equals 6.3503 Kilograms (1 st = 6.3503 kg). Convert Stones to Kilograms with formula, table, and examples.

One stone equals exactly 6.35029 kilograms or 14 pounds. This conversion is essential for British and Irish travelers, medical professionals, and anyone converting body weight between the UK's stone-based system and the metric system used in most of the world.

How to Convert Stones to Kilograms

kg = st × 6.35029318

Multiply the value in Stones by 6.35029318

Take your value in Stones
Multiply by 6.35029318
Read the result in Kilograms

Common Stones to Kilograms Conversions

Stones (st)	Kilograms (kg)	Status
0.5 st	3.1751 kg
1 st	6.3503 kg
2 st	12.7006 kg
3 st	19.0509 kg
5 st	31.7515 kg
7 st	44.4521 kg
8 st	50.8023 kg
9 st	57.1526 kg
10 st	63.5029 kg
11 st	69.8532 kg
12 st	76.2035 kg
13 st	82.5538 kg
14 st	88.9041 kg
15 st	95.2544 kg
16 st	101.6047 kg
17 st	107.955 kg
18 st	114.3053 kg
19 st	120.6556 kg
20 st	127.0059 kg
25 st	158.7573 kg
30 st	190.5088 kg
40 st	254.0117 kg
50 st	317.5147 kg

Good to Know About Stones to Kilograms Conversion

In the UK, asking someone's weight in kilograms often gets a blank stare. Most Britons know their weight only in stone and pounds. NHS records are transitioning to kilograms, but the cultural habit persists.

Stones to Kilograms: What You Need to Know

A person weighing 12 stone is about 76.2 kg (168 lbs). When a British person visits a doctor in continental Europe, they need to convert their stone weight to kilograms. Fitness apps and smart scales can display weight in stone, kilograms, or pounds. British bathroom scales often show stone alongside kilograms to accommodate both systems.

What is a Stone? st

A British unit of mass equal to 14 pounds or approximately 6.35 kilograms. Commonly used in the UK and Ireland for body weight.

Imperial body weight (UK/Ireland) horse racing

Learn more about Stone →

What is a Kilogram? kg

The base unit of mass in the International System of Units (SI). Equal to 1000 grams. Used worldwide for everyday weighing and commerce.

Metric everyday weighing commerce medicine

Learn more about Kilogram →

Going the other way? Use our Kilograms to Stones converter.

Stones to Kilograms FAQ

One stone equals exactly 6.35029318 kilograms. For quick mental math, multiply stone by 6.35 or remember that 1 stone is roughly 6 kg and a third.
Multiply the number of stone by 6.35029. If the weight includes pounds, first convert the total to stone (divide remaining pounds by 14), then multiply by 6.35. For example, 11 stone 7 lbs = 11.5 stone × 6.35 = 73.03 kg.
The stone has been used in the British Isles since medieval times. Although the UK adopted the metric system for trade in 1985, stone remained the cultural standard for personal weight because it was deeply embedded in everyday conversation and bathroom scales.

Non-Frequently Asked Questions About Stones to Kilograms

Questions nobody should ask - but someone did.

The stone (14 pounds / 6.35 kg) predates the metric system by centuries. British people use stones because it gives smaller, friendlier numbers. Saying 'I weigh 12 stone' sounds better than 'I weigh 76.2 kilograms' or '168 pounds.' It is the unit of polite vagueness.
Almost certainly not. A rock you can comfortably throw weighs about 0.5 to 2 kg. One stone (the unit) is 6.35 kg, or about 14 pounds. Throwing that would be more shot-put than casual toss.